管理线程中的线程 [英] Managing Threads in threading

问题描述

我正在做实验室练习.在本练习中，我不理解urls.length和waitHandles.waitAll.

I have a lab exercise. I do not understand urls.length and waitHandles.waitAll in this exercise.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Net;


namespace LabEx1
{
    class Program
    {
        static void Main(string[] args)
        {
            AutoResetEvent[] waitHandles = new AutoResetEvent[urls.length];

            int i = 0;
            foreach (string url in urls)
            {
                waitHandles[i] = new AutoResetEvent(false);
                ThreadInfo ti = new ThreadInfo(url, waitHandles[i]);
                ThreadPool.QueueUserWorkItem(getPage, ti);
                i++;

                waitHandles.waitAll(waitHandles);
            }
        }
        class ThreadInfo
        {
            public string url;
            public AutoResetEvent are;

            public ThreadInfo(string _url, AutoResetEvent _are)
            {
                url = _url;
                are = _are;
            }
            static void getPage(object data)
            {
                ThreadInfo ti = (ThreadInfo)data;
                WebResponse wr = WebRequest.Create(ti.url).GetResponse();
                Console.WriteLine(ti.url + ": " + wr.Headers["Content-Length"]);
                wr.Close();
                ti.are.Set();
            }
        }
    }
}

推荐答案

Google不在您所在的位置吗?尝试使用Google搜索"AutoResetEvent"，看看它能告诉您什么.

就urls.Length问题而言，urls似乎是一个字符串数组，并将该数组的长度传递给AutoRresetEvent.当然，如果您研究过AutoResetEvent，您就会知道为什么它将数组的长度作为参数传递.

Isn''t google available where you are? Try googling "AutoResetEvent" and see what it tells you.

As far as the urls.Length issue is concerned, urls appears to be an array of strings, and it''s passing the length of that array into AutoRresetEvent. Of course, if you had researched AutoResetEvent, you''d know why it''s passing the length of the array as a parameter.

检查此链接.
http://msdn.microsoft.com/en-us/library/system.threading. autoresetevent.aspx [ ^ ]

简而言之，AutoResetEvent通知等待的线程已发生事件.

WaitAll
等待指定数组中的所有元素接收信号
http://msdn.microsoft.com/en-us/library/z6w25xa6.aspx [ ^ ]

check this link out.
http://msdn.microsoft.com/en-us/library/system.threading.autoresetevent.aspx[^]

In a nutshell AutoResetEvent notifies a waiting thread that an event has occurred.

WaitAll
Waits for all the elements in the specified array to receive a signal
http://msdn.microsoft.com/en-us/library/z6w25xa6.aspx[^]

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